Study Of AlN:Re³⁺(Re³⁺:Eu³⁺,Sm³⁺,Tb³⁺) Fluorescent Materials

With the rapid development of economy currently,traditional fossil energy is becoming more and more scarce,so energy conservation or development of new energy is imminent.White light emitting diodes have become the mainstream of light emitting devices in the future by virtue of their high brightness,easy preparation,long service life,energy saving and environmental friendliness.In addition,hydrogen,a kind of new clean energy with its characteristics of zero carbon emissions,recyclable and high energy density,has become an important direction of new energy research.AIN semiconductor fluorescence materials activated by rare earth ion possess excellent fluorescence performance,which means they have potential applications in white light emitting diodes.Moreover,they also have some potential applications in photocatalytic hydrogen production.However,rare earth ion-doped AIN nanomaterials currently are limited in their further application due to their demanding synthesis conditions.Therefore,it is greatly imperative to synthesize rare earth ion-doped AIN nanometer fluorescent materials via a non-toxic,simple and cheap method.Main contents of this paper are as follows:1.Based on high-temperature solid-phase method,Sm3+doped AIN nanometer fluorescent materials were prepared with Sm3+as the activator,dicydiamine as the nitrogen source,and AICl3 as the aluminum source.Sm3+can successfully enter AIN lattice,and the doping concentration of Sm3+has a certain influence on the symmetry of Sm3+in AIN lattice.Under the excitation of ultraviolet light,AlN:Sm3+nanometer fluorescent materials present orange-red emission,and the color purity is relatively high.Optimal doping concentration of Sm3+in AIN is 1.0%.2.Using rare earth ion Eu3+as activator and hexagonal AIN as luminescent matrix,AIN:Eu3+nanometer fluorescent materials were prepared via high temperature solid phase method.Eu3+can triumphantly enter AlN lattice and change the bandgap width of the materials.The morphology of AlN:Eu3+nanometer fluorescent materials is irregular spherical.AlN:Eu3+ exhibits red emission under ultraviolet excitation,and its luminous color purity is relatively high.When the doping concentration of Eu3+is 0.8%,the excitation and emission intensity of AlN:Eu3+nanometer fluorescence materials is strongest.In addition,compared with undoped AIN,AlN:Eu3+.exhibits good photocatalytic hydrogen production activity,with the maximum hydrogen production rate of 77 mol h-1 g-1.3.Tb3+ and Eu3+ co-doped.AIN nanometer fluorescent materials were prepared by high temperature solid phase method.The results show the intense emission peaks.of Tb3+and Eu3+can be observed in the emission speetra of AlN:Tb3+,Eu3+nanometer fluorescent materials at the excitation wavelength of 338 nm,and there is an obvious energy transfer between Tb3+and Eu3+.With the increase of Eu3+concentration,the luminous color changed from green to red gradually.